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• Multi monitor setup with a tv as well?

  - by jasondavis

  I have always had a dual monitor setup for my pc's for years now. I am now in the market to build a new PC and get some new stuff. I need some help or advice on how to run 3 monitors WITH a 4th display which will be a lcd/plasma tv. So I am thinking I can get 2 video cards and that will give me all the hookups to run 3 monitors instead of 2. I will mount all 3 monitors in a row side by side and above them on the wall I would like to mount a larger 30-40+ inch lcd or plasma tv. I would then like to hook up my atelite/cable to this tv just as I would normally hook up a tv but I would like to also be able to have an option to view my PC o this tv as well. I know that is possible but would it be possible to view my PC on that tv and also still view my 3 other monitors and have the TV be a 4th display, where I could dock a different app/window in windows in all 4 displays (3 monitors + tv) ?? Please tell me any tips/advice on how to do this including what cables/software if any/converters/ you name it. Thanks for any help

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• Faster, secure, protocol/code required for long-distance transfer.

  - by Chopper3

  I've ran into a problem and I'm looking for a new secure protocol/client/server that's faster over a 1Gb/s fibre link - let me tell you the story... I have a pair of redundant, diversely-routed, 1Gb/s links over a distance of around 250 miles or so (not dark fibre but a dedicated point to point link, not a mesh). At the 'client' end I have a HP DL380 G5 (2 x dual-core 2.66Ghz Xeon's, 4GB, Windows 2003EE 32-bit), at the 'server' end I have a HP BL460c G6 (2 x quad-core 2.53Ghz Xeons, 48GB, Oracle Linux 5.3 64-bit). I need to transfer around 500 x 2GB files per week from the client to the server machines per week - but the transfer NEEDS to be secure. Using both iPerf or regular FTP I can get ~80MB/s of transfer pretty consistently, which is great. Using WinSCP or Windows SFTP I can't seem to get more that ~3-4MB/s, at this point the server's CPU is 3% busy while CPU0 of the client goes to ~30% utilised. We've tried editing various TCP window sizes with little success. Both ends are connected to quite low-usage Cisco Cat6509's with Sup720's. I can replace the client machine with a newer machine and/or move it to Linux - but this will take time. Clearly these single-threaded secure Windows clients are introducing too much latency doing their encryption. So a few questions/thoughts; Are there any higher performing secure protocols or client software for Windows that I could try? I'm pretty protocol-gnostic so long as it'll work between Windows and Linux. Should I be using hardware to do the encryption, either in the client or the network parts? If so what would you recommend? I'm not convinced that just swapping the server would be that much faster, the CPU was only at 30% but then again that's higher than I'd have expected given the load - moving to Linux at the client end may be a better idea but would be quite disruptive. Am I missing a trick? Thanks in advance.

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• Does using a hexacore CPU make sense?

  - by Exa

  I'm currently planning to upgrade my computer system and I want to exchange CPU, board and RAM. I already had a look at some hexacore-CPUs from AMD and would like to know if it makes any sense to use such a CPU with six cores. Is there any software which really uses six cores? Especially in gaming? I'm using this PC mostly for gaming and from time to time for developing. I know that on the dual-core system (2 x 3GHz) I currently use, Visual Studio creates two instances of the compiler, one for each core. Would there be six instances of the compiler on a hexacore system for super fast compiling? Is there any software that uses six cores? Would running two applications cause the usage of more CPUs? (For example two CPUs for a game you're playing while two other CPUs are used for compiling at the same time) I hope someone can point out the benefits of a hexacore system. The OS would be Windows 7 64 Bit and I use the PC for gaming most of the time. (Crysis 2, CoD, stuff like that)

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• How to migrate WinXP from failing old HD to new one

  - by Péter Török

  Following this issue, we have all our important data backed up now. I also bought and installed a new replacement hard disk (WD 160GB PATA) as secondary (slave) drive. I created two primary NTFS partitions on it: a 40 GB system partition, and a 110GB data partition. In theory I could start reinstalling WinXP from scratch on the new system partition, then copying over all user data from the old drive to the new data partition. Once this is done, I could even throw away the old drive, or keep it just to see what happens. (Note: I don't want to clone the whole drive as it contains a dual boot setup with an old Linux installation which I don't need anymore, and anyway, a fresh reinstall would do WinXP good to get rid of many years' clutter.) However, I am lazy :-) The old HD is still functioning, the problem has not manifested again since. So I feel there is no need to hurry with a complete OS reinstall. What I don't know though is whether I will be able to install WinXP on the new system partition at a later stage without affecting the contents of the data partition on the same drive. If this is possible, I can just move over all our data to the new data partition to have it safe, then continue running WinXP from the old drive as long as it works. Does anyone see any problems/risks with this plan?

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• Diagnose remote desktop freezes in Windows 7 when no BSOD?

  - by Paul Smith

  Okay, I'm getting no joy from Asus or Microsoft on this, so hoping for some clues on how to narrow down the cause. I have very frequent OS freezes, always & only when running Remote Destkop Client (mstsc) in Windows 7 x64. I never have a bluescreen, and there is never a minidump. The display & input just freezes -- no keyboard, no mouse, and sound will just continue the last wavelength if any. So far, I can't find a way to trap the hang given that there's no bluescreen; advanced startup & recovery settings for system failure are "Write an event" checked, "Automatically restart" checked, and "Kernel memory dump". I've updated to the lasted BIOS, and tried a few different graphics drivers, both generic & ATI. I've also tried disabling Aero, and everything about the remote desktop experience (incrementally unchecked every box in the mstsc - options - experience tab), even disabled/unplugged external monitor to make sure it wasn't a dual-monitor issue. My specs are: Asus G73jh notebook 8GB RAM ATI Mobility Radeon HD 5800 Series graphics (recently tried driver versions 8.791.0.0, 8.801.0.0) American Megatrends G73jh.211 BIOS (7/27/2010) Windows 7 Home Premium x64 Windows Memory Diagnostic passed all of the following at least 3 times with no errors: MATS+ INVC LRAND Stride6 WMATS+ WINVC This notebook is better than most at removing heat (laudable vent design), so I'm not inclined to suspect thermal causes (especially since running 1080p video for hours has never caused a freeze, but mstsc does, reliably, within 5 minutes to an hour). This did seem to start happening after a Windows Update, but I've since reverted every patch applied since a week before the first occurrence, with no joy. (And I'd only had the PC for a couple weeks before that, so it could have been chance + less actual time spent remoting at the beginning.) I'm at my wits end, and I bought this laptop primarily as a remote terminal client (go figure, right?) Any ideas on how to identify the cause of this? Thanks!

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• Computer won't start after installing new video card

  - by Vercas

  So, 1 year and 340 days ago I bought a desktop computer. Since then, it has served me well. But lately, I wanted an upgrade, so I bought a new video card. I documented myself about the compatibility, and it is okay. So I opened the case, cleaned up that... dust elemental living inside of it. Unscrewed the plastic thingie on the outside to unscrew the old video card. Because of the stupid arrangement of the ports, I had to unscrew the motherboard to unplug it. So I unscrewed it, removed the old card, put in the new one, moved the motherboard back, screwed it back in, screwed the video card on the holder... thingie, and screwed the plastic thingie back in. Everything went smoothly, nothing had to be forced in/out. I connected the external power supply, closed the computer case, put the tower back in it's place and all the cables back in. When I pressed the power button, the LED turned... some color I can't distinguish. It stayed that way for a second, and then it went off. I tried a bunch of things, including permuting the external power supply arrangement (1 connection, 2 connections and no connections), with no success. And here are some of the specifications: Motherboard manufacturer: Asrock Processor: AMD Athlon II X2 3.0 GHz RAM: 2 x 2GB (had only 1 initially, bought the second plate a bit later) OLD video card: AMD Radeon HD 5450 NEW video card: Gigabyte nVidia GeForce GTX 650 GPU, 1GB GDDR5 128bit PCI-E, Dual-link DVI-Dx2 / HDMI / D-Sub Power supply: 450W + all the requirements I managed to find on the internet are met (+12V 18A or something) More specific information is stored... On that computer. If required, I may open the case again and read the stickers to find more specific information. I can also provide photos if necessary. Any ideas? Suggestions? Something? :|

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• Very Slow DSL (ethernet) speed [New Interesting Update]

  - by Abhijit

  Very IMPORTANT and INTERESTING UPDATE: Due to some reason I just thought to do a complete new setup and this time I decided to again have openSUSE plus ubuntu. So I first reinstall lubuntu and then I installed OpenSUSE 12.2 (64 bit). Now, my DSL speed is working very normal and fine on opensuse. So this is very scary. Is it possible for any operating system to manipulate my NIC so that it will work fine only on that operating system and not on another os? Regarding positive thinking and not being paranoid, what is it that makes ONLY suse to get my NIC to work at normal speed but ubuntu can not do it? Not even fedora? Not even linux mint? What all these OS are lacking that enables suse to work great? == ORIGINAL QUESTION == I 'was' on opensuse 12.2 when my dsl speed was normal. Yesterday I switched from opensuse to ubuntu 12.04 and speed decreased. It came to range of 7-10-13-20-25-kbps. Then I switch to linux mint, and then to fedora. Still slow speed. When I was in ubuntu I disabled ipv6 but still no luck. Now I am in fedora but this time with DIFFERENT ISP. And still I am getting very slow sped. So my guess is this is nothing to do with os. What can be wrong? Is this problem of NIC? Does NIC speed decreases over time? Does NIC life ends over time as with keyboard or mouse? Help please All the os I used are 64 bit and my laptop is Compaq Presario A965Tu Intel Centrino DUal Core. Interesting thing to notice is I get normal speed while downloading torrent inside torrent client softwares. This slow speed issue applied to download from any web browser or installing software using terminal.

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• Help with Ubuntu and Windows, separate HDs

  - by LuxuryMode

  Need some major help. Running a Dell XPS/Dimension 630i. It came with "SATA 2 RAID 0 With Dual 500GB Hard Drives." I have installed a new, third non-raided drive and installed Ubuntu on it. So now I have Windows on the original hard drive and Ubuntu Linux on the new HD. When I get to the boot menu where I can select an OS, if I select windows I get an error: "No such drive, no such disk." Also, strangely in the first place, in order to even get to the bootloader menu I have had to disable ALL ports under the RAID config. Unless I do this, I will just get to a never-ending blinking cursor. I have tried every conceivable CMOS config and nothing else works. Tried setting port 3 (the new HD w/ Ubuntu) to first hard disk boot priority. Tried disabling all other ports and enabling the Ubuntu HD port and vice versa. I have some pictures of boot up: first one is strange error i get after messing with CMOS to finally get ubuntu install to work. http://imgur.com/5sqJa then boot menu: http://imgur.com/TWtLq then error: http://imgur.com/TJ1mS. Also, please note that I can actually access all files from the raided Windows drive through Ubuntu.

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• Why does GIMP start up so slow on my machine?

  - by muntoo

  EDIT 2: One way would be to disable script-fu. Does anyone know how to disable it at startup? Is it possible? Would GIMP still work? What wouldn't work? Could I start it later, after loading? Is there any way to speed up GIMP's startup time on Windows Vista Home Premium 32-Bit 1.6 [Dual] Intel Processors? On XP [different computer], it loads in less than 3 seconds. On Vista, it takes 20 seconds: 2 Seconds (other - fonts, brushes, etc) 18 Seconds (extension-script-fu) It just freezes at extension-script-fu. Looking at Process Explorer, I see that it's not taking any CPU at all. EDIT 1: It does seem to be taking 50% of the CPU. It gets stuck for about 18 seconds, and then starts working again. Then, the actual GIMP program pops up [...finally]. I have the latest stable version running (I think). I tried it with XP SP2 Compatibiliy mode and/or Run As Administrator, but that didn't help.

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• Ubuntu and Windows and Separate HDs, oh my!

  - by LuxuryMode

  Need some major help. Running a Dell XPS/Dimension 630i. It came with "SATA 2 RAID 0 With Dual 500GB Hard Drives." I have installed a new, third non-raided drive and installed Ubuntu on it. So now I have Windows on the original hard drive and Ubuntu Linux on the new HD. When I get to the boot menu where I can select an OS, if I select windows I get an error: "No such drive, no such disk." Also, strangely in the first place, in order to even get to the bootloader menu I have had to disable ALL ports under the RAID config. Unless I do this, I will just get to a never-ending blinking cursor. I have tried every conceivable CMOS config and nothing else works. Tried setting port 3 (the new HD w/ Ubuntu) to first hard disk boot priority. Tried disabling all other ports and enabling the Ubuntu HD port and vice versa. Here's a pic of the error I get when I try to boot to Windows: http://imgur.com/TJ1mS. Also, please note that I can actually access all files from the raided Windows drive through Ubuntu. (Someone suggested just reinstalling windows from installation CD. Agree?)

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• Optimizing Apache for large file serving

  - by D_Guy13

  I have a random problem with Apache that I can't quite figure out, here is my setup, Windows Server 2008 R2, 64 Bit, 5GB RAM, SSD with 200 MB(Read/write) and Dual Core CPU @ 2.1 GHz A dump from mod-staus, Server Version: Apache/2.4.7 (Win32) mod_limitipconn/0.24 mod_antiloris/0.5.2 PHP/5.5.9 Server MPM: WinNT Apache Lounge VC11 Server Built: Nov 21 2013 20:13:01 Current Time: Thursday, 21-Aug-2014 23:38:06 W. Europe Daylight Time Restart Time: Thursday, 21-Aug-2014 20:30:47 W. Europe Daylight Time Parent Server Config. Generation: 1 Parent Server MPM Generation: 1 Server uptime: 3 hours 7 minutes 18 seconds Server load: -1.00 -1.00 -1.00 Total accesses: 283025 - Total Traffic: 1172.2 GB 25.2 requests/sec - 106.8 MB/second - 4.2 MB/request 62 requests currently being processed, 388 idle workers Serving large .zip & iso files using mod_xsendfile. (File size range 500 MB - 1.5 GB) The setup works and is running fine. CPU usage is very unstable, jumps all the time between 10% - 90% and the servers goes down when it hits 100%. In that case I have to hard restart the server. Server it outputting traffic at 30 Mbps. Is there anything else I should think about to get a more stable CPU usage? Is that CPU usage normal? Can switching to Linux help me achieve better CPU usage?

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• Computer not finding hard drives on boot -sometimes-

  - by todd.pund

  Computer specs: Mobo: Gigabyte ultradurable 3 - GA-970A-UD3 Processor: First gen I7 3.2GHZ Ram: 8GB Kingston DDR3 1066 Video Card: EVGA NVidia GTX 460 1GB Hard Drive: 500MB 7200rpm x2 (can't remember brand, sorry I'm at work.) Last week my developer preview for Windows 8 ran out so I put my copy of windows 7 back on the computer. The computer at that point started suffering from frequent freezing and crashing. When I rebooted the computer sometimes it wouldn't find the system HD at all. When I looked at the post screen it seemed to show that it wasn't finding either of the HDs. Then yesterday when turning on the computer I just got GRUB as a message (not a GRUB prompt, just GRUB) I haven't had a dual boot of Linux for at least a year. I loaded windows 7 recovery console from the disk and ran: bootrec /fixboot bootrec /fixmbr Which did not help. At that point I just installed Ubuntu 13.04 over the windows 7 install and still received the GRUB post. I went into the BIOS and switched the Hard Drive priorities and then it loaded into Ubuntu fine. For several days everything was just hunky dory until I installed the Ubuntu version of Steam, install Portal and tried to run it. At that point the computer froze and after hard rebooting couldn't find the hard disks again. Then after restarting the system it loaded up fine again and no issues since. (I have not tried to launch portal again). My next thought is to remove the system hard drive and try to use the secondary as the master to see if the primary HD is bad. I'm sorry if this has been confusing, I'll answer any questions I can. Any thoughts?

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• My bios datetime is resetting to 2002, what should I do?

  - by Thierry Lam

  I bought my PC brand new in mid-2006. I'm currently dual booting Win XP 32 bits and Ubuntu Karmic Desktop. Over the last few days, when I boot up my computer, it tells me that my bios time is not set. I now have 2 choices for booting in: Windows first: I can safely get into Windows but the date now shows 2002/01/01 at 00:00. From there, Windows will not sync its time to its servers, I have to manually advance the date myself. I can also advance the date from the bios at startup. Ubuntu first: Since the time date is still set at 2002, the boot system cannot find my linux partition. I can fix that issue by booting to Windows, set the date properly and the linux issue will be fixed automatically. The above two issues can also be fixed if I manually set the bios date/time manually when I turn on my computer. It's annoying to do that every single day since I shut down my PC daily. Am I having an OS issue or a hardware issue? How can I resolve this problem?

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• ping incorrectly pinging 127.0.0.1

  - by AlexW

  I've got an odd DNS issue. I'm running a dual ipv4/ipv6 environment on Linux. Pinging some sites results in ping pinging 127.0.0.1. e.g. #> ping authserver.mojang.com PING authserver.mojang.com (127.0.0.1) 56(84) bytes of data. 64 bytes from localhost.localdomain (127.0.0.1): icmp_seq=1 ttl=64 time=0.045 ms 64 bytes from localhost.localdomain (127.0.0.1): icmp_seq=2 ttl=64 time=0.043 ms 64 bytes from localhost.localdomain (127.0.0.1): icmp_seq=3 ttl=64 time=0.058 ms --- authserver.mojang.com ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2000ms rtt min/avg/max/mdev = 0.043/0.048/0.058/0.010 ms Dig, however correctly returns the following: # dig authserver.mojang.com ; <<>> DiG 9.9.3-P2 <<>> authserver.mojang.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15800 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ;; QUESTION SECTION: ;authserver.mojang.com. IN A ;; ANSWER SECTION: authserver.mojang.com. 5 IN A 54.235.119.47 ;; Query time: 14 msec ;; SERVER: 2001:4860:4860::8888#53(2001:4860:4860::8888) ;; WHEN: Sat Nov 09 15:34:40 GMT 2013 ;; MSG SIZE rcvd: 66 I'm confused! My web browser returns the correct website, and the same computer booted into Windows also works correctly.

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• Cisco configuration for public library internet

  - by AlternateZ

  I'm a C/C++ computer programmer turned IT support guy working for a public library. My day is usually spent helping random grandparents learn how to use email, so my networking knowledge is limited to what I can glean from google. Here's the situation. We have a public library with 20 PCs on a LAN and also public wifi access. Previously we were running all of this on 1 ADSL connection and people complained about low speeds. We hired a networking company to set up a Cisco dual-WAN router for us, and purchased an additional ADSL connection. The intention was to give the LAN PCs a guaranteed amount of bandwidth each, and then let the wifi users split the rest. The results were far worse than what we expected, and all we got from the company was excuses and they've since washed their hands of us. During busy periods, net performance on the LAN PCs are so poor that attaching files to gmail etc often times out and fails - far from the "guaranteed amount of bandwidth each" that we hope for! Sometimes it feels like performance is worse than before when we had 1 ADSL link and an unconfigured router? Anyways, surely this is a problem encountered a million times over across the world? (Sharing internet across many users effectively.) What are standard solutions for something like this? I admit to not even knowing the right jargon to google for (load balancing?) I'd appreciate any links to resources/guides that might help me get a better understanding of the problem/solutions, and perhaps some stories of your own experience in solving similar problems. This will help us evaluate and negotiate with network consultants in the future. If its relevant, our router config contains a section "policy-map" with "bandwidth percent" for each class of user (LAN, wifi), and "fair queue".

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• Computer loop restarts on Windows loading

  - by Robinson G.

  My computer restarts, just after or during Windows loading (4 squares getting together), or after some time on the desktop IF I'm idle. In order to start the computer I either have to swap my RAM (24Go) in differents DIMM slots, for example (I have 4 slots) : 1-2-4 or 2-3-4 or 1-3-4, not the same position each boot or it restarts in a loop... I can also change the ram timing from 1.5 to 1.6V and it starts, at the next reboot I have to change it again to 1.5 or it won't boot... And If after all, I succeed to boot, I have to use the computer for about 10 minutes, and it's ok, if I don't, it restarts by itself after some minutes. If I stay on the BIOS, It's all OK, I can stay for a whole year without restarting. I have check my RAM on Memtest (4*8G SDRAM DDR3) : OK I have check without graphic card : Still the same. I tried to reset the bios stack by getting it off and on : Still the same. I tried to reset my BIOS, and many settings about the RAM in the menu : Still the same. CPU temps are just fine (around 35°C) I was thinking ofc about the motherboard but I want to be sure. Motherboard : MSI zh77a-g43 RAM : 4*8G Dual Mode or not (depends on the number I put ofc.) PSU : 600W (enough to run all the config) CPU : i7 3770 non K

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• Display stretches 4:3 ratios; Adds scrolling to other ratios

  - by Matt

  I have a dual monitor setup. Normally, they both display at 1680x1050. They have been setup this way for about a year. I'm using Windows XP Professional 2003 x64 SP2. Today, out of nowhere, one of the monitors kicked back to a lower resolution. I was not playing with any configuration at the time.. in fact all I had done was close a window (maybe a browser). But the thing is that the resolution is still preserved partially by the fact that the screen will scroll when you move the mouse. So it's like looking through a 1024x768 window into a 1680x1050 world. The monitor itself does not appear to be damaged, because I also have it connected to my netbook (via KVM) and higher resolutions work fine. I tried uninstalling/reinstalling the drivers to no avail. System restore doesn't help either. I'm unsure of the exact ATI card I'm using.. Device Manager lists it as "Radeon X300/X550/X1050". There is no Catalyst Control Center software installed. I tried to install it, but there doesn't seem to be a way to install it by itself ... it forces you to install another driver, which breaks both of my displays, forcing me to go into safe mode and run system restore again. Any ideas? Thanks EDIT: After playing around more, I discovered that the "scrolling" behavior is only present for aspect ratios that are not 4:3. For 4:3 ratios, it just stretches out to fit the wide screen. My monitor's native ratio is 16:9 .. what could be causing it to think it needs to scroll?

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• How to locate phpmyadmin on ubuntu

  - by Chris

  Okay, I'm usually a windows user and I write quite happily there, unfortunately (or fortunately) I have installed linux on a dual boot and having installed some software I have a question... Where is it? I installed Apache, PHP, MySQL and separately phpmyadmin, Apache is up and running, I've seen my phpinfo page and MySQL is there. MySQL is telling me that there's a database for phpmyadmin, but...erm.. I can't seem to locate it. On a windows machine the directory would be in the www directory and I'd just navigate there... localhost/phpmyadmin/ but on Ubuntu I can't find it in the equivalent. I've been to /var/www/ and there's my index.html (from apache) and my phptest.php file but no phpmyadmin. There is a phpmyadmin in /lib but that only has 2 files in it. So having rambled lots, my question is, what do I have to do to be able to navigate to the phpmyadmin index page? I realise this could fall under the description of a server related question and should be posted elsewhere but as it's software on a home system some help would be appreciated. Do I need to move some files from somewhere? Help! I really don't want to have to go back to developing on Windows as I'll be deploying to a lamp system, my learning curve will be steep.

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• Need Help Scoping a Server to use for study (MCITP Ent Admin + SharePoint 2010)

  - by AVFamily76

  i need to study for mcitp, but i also need to study for sharepoint 2010 i have a poweredge 1850 with two single-core CPUs + two 73G drives - it kills me on electricity, so don't want to use it, and it won't do VT, but it could be one of three boxes for a lab that's cheap, but will cost a lot on electricity i was thinking . . . OPTION #1 Opteron 4170 HE (50 watt chip), 6-core, only two-bills ($200), but the board's are $250, so that's an $800 box, then get another box to dual-boot Win7/Hyper-V on the cheap...? OPTION #2 Used Quad - but how many VM's that are really banging away could it run at same time? (Server 2008r2, SQL 2008r2, Search Server) OPTION #3 Study from books and just get one box that can run two VM's at same time, even if slowly. the last time i had and used a home lab was five years ago when i had a DC, SQL, Exchange and business app box, that's where i got my server skills was just banging on it for four years, but didn't read any books, so now i have to get certified and know the material, and just am not sure how much attention i should pay to the box i use versus the studying time and reading. sorry it's a subjective question, and am obviously open to all sorts of abuse here, but hope you can tell me also how many VM's i can run at the same time given what they'll be doing (SQL and SharePoint FAST search server are resource hungry) thanks!

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• Tuning Linux + HAProxy

  - by react

  I'm currently rolling out HAProxy on Centos 6 which will send requests to some Apache HTTPD servers and I'm having issues with performance. I've spent the last couple of days googling and still can't seem to get past 10k/sec connections consistently when benchmarking (sometimes I do get 30k/sec though). I've pinned the IRQ's of the TX/RX queues for both the internal and external NICS to separate CPU cores and made sure HAProxy is pinned to it's own core. I've also made the following adjustments to sysctl.conf: # Max open file descriptors fs.file-max = 331287 # TCP Tuning net.ipv4.tcp_tw_reuse = 1 net.ipv4.ip_local_port_range = 1024 65023 net.ipv4.tcp_max_syn_backlog = 10240 net.ipv4.tcp_max_tw_buckets = 400000 net.ipv4.tcp_max_orphans = 60000 net.ipv4.tcp_synack_retries = 3 net.core.somaxconn = 40000 net.ipv4.tcp_rmem = 4096 8192 16384 net.ipv4.tcp_wmem = 4096 8192 16384 net.ipv4.tcp_mem = 65536 98304 131072 net.core.netdev_max_backlog = 40000 net.ipv4.tcp_tw_reuse = 1 If I use AB to hit the a webserver directly I easily get 30k/s connections. If I stop the webservers and use AB to hit HAProxy then I get 30k/s connections but obviously it's useless. I've also disabled iptables for now since I read that nf_conntrack can slow everything down, no change. I've also disabled the irqbalance service. The fact that I can hit each individual device with 30k/s makes me believe the tuning of the servers is OK and that it must be some HAProxy config? Here's the config which I've built from reading tuning articles, etc http://pastebin.com/zsCyAtgU The server is a dual Xeon CPU E5-2620 (6 cores) with 32GB of RAM. Running Centos 6.2 x64. The private and public interfaces are on separate NICS. Anyone have any ideas? Thanks.

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• VMWare vSphere 5: 4 pNICs for iSCSI vs. 2 pNICs

  - by gravyface

  New SAN for me, never used before: it's an IBM DS3512, dual controller with a quad 1GbE NIC per controller that a client bought and needs help setting up. Hosts (x2) have 8 pNICs and while I usually reserve 2 pNICs for iSCSI per host (and 2 for VM, 2 for management, 2 for vMotion, staggered across adapters), these extra ports on the SAN have me wondering if storage I/O would be significantly improved with 2 additional NICs per host, or if the limitations of the vmkernel/initiator would prevent the additional multipaths from ever being realized. I'm not seeing alot of 4 pNIC iSCSI implementations per host; 2 is the de facto standard from what I've read/seen online. I could and probably will do some I/O testing, but just wondering if there's a "wall" that someone else has discovered long ago (i.e. before 10GbE) that makes a 4 NIC iSCSI per host setup somewhat pointless. Just to clarify: I'm not looking for a how-to, but an explanation (link to paper, VMWare recommendation, benchmark, etc.) as to why 2-NIC configurations are the norm vs. 4-NIC iSCSI configurations. i.e. storage vendor limitations, VMKernel/initiator limitations, etc.

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• Load is 0, yet site crawls (sometimes). What gives?

  - by Yegor

  I have a ~1.5-2mil page views per day site running on 2 servers. One for mysql, other for everything else. Mysql box has a load of 3, frontend is usually 0.0-0.1. Both are dual quad core with 8GB ram running SAS drives in raid5. CPU is idle for majority of the time, iowait is non-existent. Im running nginx, memcache, and site is built on php. Half the time everything runs perfect, while at other times it lags something severe, when it takes 10-15 seconds for a page to load. Page execution time is always super low, but it seems to hang, waiting for something before it actually loads the page. Whats even more weird is that it only happens to 1 file on the site (but its the one thats most commonly accessed, that actually loads the content on the site). Other pages are super fast at all times, even when it takes 15 seconds to load actual content. I have nginx_stats plugin installed, and if I monitor it, the lag spikes happen when the write column starts going above 100, and it frequently does... all the way to 500-1000. It does so at totally random times... not when traffic is heavy... it can do this in the middle of the night, and work perfectly at 5pm when traffic is at its highest. Any ideas?

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• 'The rpc server is unavailable' or 'access is denied' error when using Remote desktop Services Manager on Windows 7 (but mstsc.exe works!)

  - by tbone

  I am trying to connect to a Windows XP workstation from a Windows 7 Ultimate workstation using Remote Desktop Services Manager. I am able to do a Remote Desktop (mstsc.exe) session from the Win7 machine to the WinXP machine with no problem at all. When running the Remote Desktops Admin (tsmmc.msc) too on a Windows XP box, I can also connect with no problem. However, when I use the new Remote Desktop Services Manager on Windows 7 and try to connect, I get the error: "The rpc server is unavailable" What could cause this? Has there been some fundamental change in Remote Desktop Services Manager, does it connect in a different way somehow? Update #1 Turned off firewall on the Windows XP box and the "The rpc server is unavailable" error went away; so RDSM seems to be using an entirely new port/connection/service compared to mstsc.exe or the old Remote Desktops Admin tool. Now... after disabling the firewall, I get a new error: Access is Denied. After doing some googling, I found some articles discussing this; basically, the error is very misleading - the actual problem is, if either side of the connection has dual monitors, and they are not both Win7 Ultimate, then you cannot connect using Remote Desktop Services Manager...the reason is, by default it uses the /multimon switch, and this switch requires a certain level of Windows license - and, there seems to be no way of changing this default (if anyone knows of a way to change this default, please post an answer or comment!). Nice going Microsoft. http://social.technet.microsoft.com/Forums/en-US/windowsserver2008r2rds/thread/4d06278f-e0f4-4f8e-a8e1-3697ee967ef4 http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Windows/Windows_7/Q_26225743.html

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• Random keyboard malfunction - happens in Vista and XP

  - by Stupefy101

  For some weird reason, some of my keyboard keys of my deskop are acting very strangely. I don't remember a certain time when it started and I can't recognize any pattern as to when it happens and when it doesn't. The problem occurs in Windows XP, XP Safe Mode, Vista, and Vista Safe mode (I have a dual boot system) Here's what's happening: When I push the I, K, comma, or 8 keys (notice how they are all in the same column), instead of just getting that character, I get extra characters afterwards. For example, I'll push the k key and it will print "ksfda", pushing "I" gives me "IWREQ", comma gives me ", xvcz", pushing 8 gives me "82431". There are a couple things that I have noticed: It does not happen every time I push the key It happens in all OS and applications I have tested The characters coming after the desired ones are in the same pattern (column order: 2, 4, 3, 1 from the left of the keyboard in the same row as the key pressed. Pressing "]" will sometimes give me "]t", and if done in Notepad, will bring up the "Find" dialog window I cannot seem to remember a specific time the problem started, although I have been defragging, using TuneUp Utilities + CCleaner, and installing lots of new programs lately.

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• my cpu won't start. all fan were spinning for a second then nothing happen

  - by Tommy

  I need help about this.. I'm from Malaysia.. Back then my cpu is all okay..and it's 4 year old.. I think this question is answered before but i'm still don't understand.. when i plugged my cpu..turn it on and all of the fan (graphic card, mobo fan and PSU fan) were spinning just for a second than nothing happen.. I don't know if it is because of the PSU or my mobo.. I sent my cpu to the shop and they said it must be the mobo.. They tell me to change my mobo and PSU also..and it cost over 100 buck (rm300 in Malaysia). and i'm real 'dry' right now. My whole data is inside the HDD. School projects, photos, games, and many..I really-really need my cpu back alive.. My mobo is MSI MS-7529 with dual core chips. My PSU is ATX-480W. the PC store guy said i need to change to new ASUS mobo if I want. I dont know what type it is but Then he tell me to change my PSU also because he don't think my old PSU (ATX-480W) ain't compatible to the new mobo.. I was very need a help from you techie guys.. sorry for my terrible English..

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